As the title says, on one of my old server RoundCube/Horde, desktop based email clients all working fine. No issues in sending out or receiving emails.
But, since last week, when trying to send email using SquirrelMail from any account/domain, it just says:
Any idea what could be wrong?
But, since last week, when trying to send email using SquirrelMail from any account/domain, it just says:
No entry goes to /var/log/exim_mainlog, just plain simple reject.ERROR
Message not sent.
Requested action not taken: mailbox unavailable
Server replied: 550 This message was classified as SPAM and may not be delivered
Any idea what could be wrong?